How to change the name of a Kotlin property to match the field to on Firebase database

I want to change the name of the field that a Kotlin property is pointing to on Firebase database.

For instance:

I have the property count in Kotlin

var count: Int

But the name on Firebase is items_count.
I’ve already tried using: when I try using

var count: Int

But it doesn’t work.

I achieved it using:

var count: Int